However, we can offer some estimations based on available data from organizations like UNESCO (United Nations Educational, Scientific and Cultural Organization) and the World Bank:
* Total number of students worldwide: Estimates range in the hundreds of millions, perhaps exceeding a billion, when considering all levels of education (primary, secondary, tertiary). The exact number fluctuates due to population changes and varying levels of access to education.
* Distribution between high school and upper education: This distribution is highly variable depending on the country's development level, its educational systems, and cultural factors.
* High-income countries: A significantly larger proportion of the student population will be in upper education compared to high school. Many students complete high school and then proceed to universities or other post-secondary institutions.
* Low-income countries: A greater percentage of students may be enrolled in high school, with a smaller fraction progressing to higher education due to factors like cost, access, and societal expectations.
* Middle-income countries: The distribution will likely fall somewhere between the two extremes, varying based on the specific country's context.
To find more specific data, you would need to consult reports and statistics from individual countries and international organizations like UNESCO's Institute for Statistics (UIS) and the World Bank's data portal. These often present data broken down by region, income level, and educational level, but even then, the data is often an estimate with a margin of error.